#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    int flags, opt;
    int nsecs, tfnd;

    nsecs = 0;
    tfnd = 0;
    flags = 0;
    while ((opt = getopt(argc, argv, "nt:")) != -1) {
        switch (opt) {
            case 'n':
                flags = 1;
                break;
            case 't':
                nsecs = atoi(optarg);
                tfnd = 1;
                break;
            default: /* '?' */
                fprintf(stderr, "Usage: %s [-t nsecs] [-n] name\n",
                        argv[0]);
                exit(EXIT_FAILURE);
        }
    }

    printf("flags=%d; tfnd=%d; optind=%d\n", flags, tfnd, optind);

    if (optind >= argc) {
        fprintf(stderr, "Expected argument after options\n");
        exit(EXIT_FAILURE);
    }

    printf("name argument = %s\n", argv[optind]);

    /* Other code omitted */

    exit(EXIT_SUCCESS);
}

